*{
    margin: 0;
    padding: 0;
    font-size: 18px;
    font-family: "微软雅黑", serif;
    color: #000;
}
a{
    color: #000;
    text-decoration: none;
}
a:hover{
    text-decoration: underline;
    color: blue;
}
ul{
    list-style: none;
}
input{
}
input,
.btn{
    height: 44px;
    border-radius: 4px;
}
.btn{
    background: #1ad8ff;
    width: 100px;
    border: 0;
    color: #fff;
    cursor: pointer;
}
.bg_sky_blue{
    background: #1ad8ff;
}
.w20{
    width: 20%;
}
.w25{
    width: 25%;
}
.w50{
    width: 50%;
}
.w75{
    width: 75%;
}
.border_grey{
    border: 1px solid #e5e5e5;
    border-radius: 4px;
}
.mask{
    position: fixed;
    display: none;
    background: rgba(0,0,0,0.3);
    width: 100%;
    height: 100%;
    top:0;
    left:0;
}